This instance helps to check whether a Transfer can be done.
private final TextTransfer textTransfer
public void dragFinished(DragSourceEvent event)
public void dragSetData(DragSourceEvent event)
This method is called if the mouse button is released over the target.
The possible data types of the receiver are known therefore: The receiver may accept
a text transfer if it is a text editor, or a file transfer if it is a file browser etc.
The type of transfer can be tested with event.dataType.